Anyone know where I can get a standard thread 24t fix gear cog, preferably 1/8"?

I have a Surly (IIRC) 23t. I have heard from when I was looking for that one that 24s exist but so far I haven't had any luck. Thanks.

Ben

Never seen one. It would probably be easier to go down a couple teeth on the chainring for whatever GI you're looking for.

I think the 24s exist like 144 BCD Campy 41t chainrings exist. I've never seen one but met someone recently who claims to have two.

Ben

Brick Lane Bikes - track sprocket (14-24t)

I have seen 41t 144s they are rare as heck but exist. 24t 1/8 fixed gear cog I am more doubtful of. I am sure there is a custom maker out there who can do it but you are probably better off going to a smaller front chainring so you can more easily find cogs!

1. See my post above.

2. Click the link.

Nope, they don't exist.

To be fair I was writing my post as you were writing yours but you got posted quicker as I probably got distracted and posted a little after yours (4 mins to be exact)

So I guess they do exist. It is just an odd size but cool that it exists in case my legs decide my gearing now is not suitable which I am doubtful of because it is a decent one for me.

You're giving in too easily. Here on BF, you're obligated to continue defending your assertions long after someone posts conclusive PROOF that you're wrong.

So, get some backbone and get with the program. Wishy washy folks who admit they might have been wrong aren't needed here.

LOL! I am actually glad on this one, BLB has a ton of a awesome vintage stuff including a Teledyne Titan frame and a Hetchins frame in my size that almost has me considering taking out my wallet and spending some money I don't have on one of them plus some NOS Suntour Pro XC hubs I don't even have a use for. Luckily the Hetchins is 110 spaced and I wouldn't want to bother with finding a hub that tiny (maybe try a 6 bolt track cog and some sort of boost spaced front hub?) and the Titan is a cool piece of history but I really don't want such a vintage Ti frame.

Thanks Scrod!

I am limited to a 38t chainring (I believe) if I want to stay with 130 BCD. This is for a fix gear to be set up with three chainlines, a flip-flop fix-fix hub and a custom 1/8" dingle. This is going on my old Mooney. Horizontal dropouts but just '70s Campy, not esp long. For this year's Cycle Oregon. 45 miles of gravel with 1000' plus both ups and downs on that gravel. Nw way my skinny tired (25c max) good fix gear is going. I want 35c which will fit easily on the Mooney.

Running 1/8" chain and 130 BCD means I am limited to a 38t chainring. (I think a 37t could be made a la 144 BCD 41t but I suspect they are an order of magnitude harder to find. Not bothering to chase that one.) You can quickly see that getting a good low gear for serious climbing on gravel is a challenge. 38-23 is 45". 38-24 is 43", about 4% better. Yeah, 4%, so what? At 64 yo, you take 4%. I may even use a triple crank and run a 36 or smaller on the inside and just accept that I will have to run a narrow ring climbing. (If I ran my tentatively planned 46-42-38 triple, I can use simple 10mm bolts with shoulders and old fashioned nuts instead of traditional chainring bolts and sleeved nuts. Rock solid! Riding fixed with a low gear, narrow cog and the much smaller bolts of a traditional inner ring scares me. Two things I do not want to see - a gear failure related crash; I've done enough for a lifetime and broken specialized gear because this will be the boonies. There won't be spares to be had. Climbing and descending go to the last day.

Since I cannot move the hub much and don't want to mess with chain length, I need to have a multiple chainline set-up with each pair of ring and cog adding up to roughly the same total teeth. So I am (tentatively) thinking or running a 46-42-38 X 13,17,21 with the 17 and 21 made up as a dingle. (Gear inches 96", 67" and 49") For gravel I will also bring the bigger cogs and settle for having to pull out the cog wrench mid ride. Not a big deal; I've done that the 4 COs I have ridden fixed using that wrench on the big hill days.

Yes, I know my numbers don't quite add up. Still working on this. I had been working on the assumption that I could not get a 24t and could use a 36t on 130 bCD until I drew it to scale. Good thing is I don't need the final answer until I order the rings and have the dingle made.

(This is why I ordered the Mooney with horizontal dropouts 39 years ago. It had to be able to be ridden fix gear. Never dreamed I would be doing this!)

Ben

Scrod, I am holding the rare 24t cog in my hand as I type this. Beautifully made. Chromed so I have no idea how hard it is (or how round it is). For 31 pounds British including shipping, ~10 day arrival and a 1.2 exchange rate, I can't complain! (Like unicorns, when one is offered you and you need it, you don't quibble the price.)

Edit: The gearing has evolved to 110 BCD using a Sugino GT (triple) crank, 175 and in almost new condition ($25 at the first shop I went to yesterday!). 46, 42 and 38t rings will be bolted on with 10mm shoulder bolts. 21t and 17t cogs will be "dingled". Other side of the hub will be a 13t cog. I'll have the 24 for the toughest gravel day, used with a 36t ring instead of the 38. This will give me gears of 96", 67" and 49" with a super-low of 41". (And yes, 41" is super low if you restrain yourself to off the shelf 1/8" velodrome compatible parts! Well, 110 BCD isn't. But the rest is.)

Ben

NICE! Can you please post a picture of the 24T cog. We all want to see it. With our own eyes!

It's going to be a while. I am still digital picture illiterate. But when I get this bike up and running, I am going ot have to educated!

Ben